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Title: Behaviour and static strength of overlap tubular K-joints in offshore structures
Author: Gazzola, F.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2001
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This thesis presents the findings of a numerical investigation of the behaviour and static strength of overlap tubular K-joints in offshore structures. The aim of the research is twofold: generate reliable strength data of axially and moment loaded overlap/gap K-joints, by means of a well validated Finite Element (FE) procedure; to develop capacity prediction formulae that will form the basis for future design guidance. Using a previously presented finite element study of axially loaded overlap tubular K-joints as a platform (Dexter, 1996), further work was conducted which aimed at extending and enhancing the strength estimation equation already presented. The robustness and reliability of the new, extended equation (Swansea equation) to predict the axial capacity of test joints was positively established against two experimental databases (Makino et al, 1996 and the underlying database of the forthcoming ISO 13819-2). With the view that the Swansea formulation may be adopted to replace that proposed by ISO for design practice, the numerical constants in the Swansea formulation were simplified and a mean bias factor was derived to convert it to characteristic format. In contrast to axially loaded tubular joints, moment loaded joints, in particular those with braces that overlap, are much less well researched and, consequently, comprehensive design guidelines are lacking. A numerical study on gap and overlap K-joins under in-plane bending (IPB) was conducted. The numerical model was satisfactorily validated against the few test data on gap K-joints that are available (HSE, 1989b). A substantial parametric study was then performed. A new strength a prediction formulation for overlap K-joints under IPB was then developed based on the results of the FE study.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available